Fundamentals of traveling wave ion mobility spectrometry.
Fundamentals of traveling wave ion mobility spectrometry.
复制标题
DOI：
10.1021/ac8016295
复制
发表时间：
2008-12-15
影响因子：
7.4
通讯作者：
Smith, Richard D.
中科院分区：
文献类型：
--
作者：
Shvartsburg, Alexandre A.;Smith, Richard D.
行波离子迁移谱 (TW IMS) 是在 Synapt IMS/质谱系统 (Waters) 中实施的一种新 IMS 方法。尽管其被广泛采用，但 TW IMS 的基础仅被定性地理解，控制离子渡越时间（分离参数）和分辨率的因素仍然不清楚。在这里，我们使用推导和离子动力学模拟来开发 TW IMS 理论。关键参数是最陡波斜率处的离子漂移速度与波速的比率(c)。在 lowc 下，离子传输速度与迁移率 (K) 和电场强度 (E) 的平方成正比，这与漂移管 (DT) IMS 和微分迁移率分析仪中的线性缩放相反。在较高的 c 处，缩放比例以由波形轮廓控制的方式偏离二次，对于理想的三角形轮廓变得更加平缓，但对于具有变量 E 的实际轮廓，首先变得陡峭，然后变得更加平缓。在最高c处，渡越速度渐近地接近波速。与 DT IMS 不同，TW IMS 的分辨率取决于移动性，在低限时按 K1/2 缩放，在较高限时按 K1/2 缩放。传输时间对迁移率的非线性依赖性意味着 TW IMS 的真实分辨率与频谱指示的分辨率不同。在~300−400% 的迁移率范围内可以实现接近最佳的分辨率。主要预测趋势与肽离子的 TW IMS 测量结果一致，作为迁移率、波幅和气压的函数。还讨论了适当的 TW IMS 校准和场加热引起的离子畸变问题。对 TW IMS 分离的新定量理解可以合理优化仪器设计和操作并改进光谱校准。
Traveling wave ion mobility spectrometry (TW IMS) is a new IMS method implemented in the Synapt IMS/mass spectrometry system (Waters). Despite its wide adoption, the foundations of TW IMS were only qualitatively understood and factors governing the ion transit time (the separation parameter) and resolution remained murky. Here we develop the theory of TW IMS using derivations and ion dynamics simulations. The key parameter is the ratio (c) of ion drift velocity at the steepest wave slope to wave speed. At lowc, the ion transit velocity is proportional to the squares of mobility (K) and electric field intensity (E), as opposed to linear scaling in drift tube (DT) IMS and differential mobility analyzers. At higherc, the scaling deviates from quadratic in a way controlled by the waveform profile, becoming more gradual with the ideal triangular profile but first steeper and then more gradual for realistic profiles with variableE. At highestc, the transit velocity asymptotically approaches the wave speed. Unlike with DT IMS, the resolving power of TW IMS depends on mobility, scaling asK1/2in the low-climit and less at higherc. A nonlinear dependence of the transit time on mobility means that the true resolving power of TW IMS differs from that indicated by the spectrum. A near-optimum resolution is achievable over an ∼300−400% range of mobilities. The major predicted trends are in agreement with TW IMS measurements for peptide ions as a function of mobility, wave amplitude, and gas pressure. The issues of proper TW IMS calibration and ion distortion by field heating are also discussed. The new quantitative understanding of TW IMS separations allows rational optimization of instrument design and operation and improved spectral calibration.
登录
查看更多内容
影响因子：
1.8
作者：
Beegle, LW;Kanik, I;Hill, HH
通讯作者：
Hill, HH
影响因子：
8.6
作者：
Hudgins, RR;Dugourd, P;Jarrold, MF
通讯作者：
Jarrold, MF
影响因子：
7.4
作者：
Robinson, Errol W.;Shvartsburg, Alexandre A.;Smith, Richard D.
通讯作者：
Smith, Richard D.
影响因子：
15
作者：
Shelimov, KB;Jarrold, MF
通讯作者：
Jarrold, MF
影响因子：
7.4
作者：
Bagal, Dhanashri;Zhang, Heidi;Schnier, Paul D.
通讯作者：
Schnier, Paul D.